Dont forget Dlink!
D-link also do a similar one, and considerably cheaper. <£60, so about the same price as the single socket versions + a cheapo separate switch, and a lot neater. I've had the D-link one going for a few weeks now, and it works a dream in a situation where I couldn't string cable.
As for previous post mentioning that these take more power and cost more than a bit of ethernet cable- I guess many people may not have realised that....